Improvement in saw-swages



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WILLIAM CLIIMSON, OF MIDDLETOWN, NEW YORK.

Letters Patent No. 101,099, elated March 22, 1870.

. IMPROVEMENT IN SAW-SWAG-ES.

The Schedule referred to in these Letters Patent and making part of the same ANew York, have invented certain useful Improvements in Swages for Upsetting or Swaging the Points of Saw-Teeth, of which thefollowing is the specication.

In the drawings- 'Fignre l is a side view ofthe improved swage;

Figure 2 is an edge view of the same; and

4Figure 3 represents another or modified form of swage.

In keeping the teeth of saws in the proper shape, and especially' so with teeth that are insei'table, it is necessary to occasionally spread or upset the cutting edges of the teeth,so as to keep them of the proper width, and so that the teeth shall out a kei-f wide enough to free the saw-plate from danger' of being heated, in consequence of the friction of the plate upon the sides of the korf, and to do this successfully a proper swage or tool for upsetting or spreading the cutting edges of teeth is employed.

XVhen this swage is properly placed upon the points 0r cutting edges of the teeth, a blow is struck upon the 'other end of said swage by a hammer, hard enough to accomplish the desired result, or it may require a series of blows by the hammer upon the swage to give the proper shape to the tooth, and an experienced operator would always place the swage correctly upon and in the right directionwith the two 4angles oi thc tooth, when the force of the blow given by the hammer would eiiectually produce the result desired; but saws sometimes go into the control of persons who are not experts in this method of keeping the saw-teeth in proper shape; hence, with a common swage, and the swage struck by a hammer, the percussive force and direction of which is not in the proper line, there is danger of breaking off the points ot' the teeth, or, if not broken, some may be bent in one direction and others in the other direction, much to the injury of the saw, and, in order to avoid this liability of breaking olf or improperly bending or upsetting the Aedges of thc teeth, is the object of this invention; and

It consists int-he inserting in the swage and around the upsetting-dies of elastic or spring guides, that will, as the swage is placed upon the point of`a tooth and a blow given by a hammer upon the swage, guide th'e point of the tooth to the upsetting-dies in the right position, even provided the tool does not have the `exact position with relation to the sides of the tooth, or the direction of the percussive force of the blow may not be in the proper lineuponthe swage, as the spring guides will have the eect to give the proper 'direction to the tool upon the tooth, and neutralize the usual form, and having the transverse holc near its end to receive the spring a, having the projecting lips a', and encircling the upset-dies l) b.

The hole which -receives the dies and spring is cut out to the end of the swage, so that the spring lips a will project a sufiicient distance from the end of the swage to have the proper elasticity to give the direction of the swage upon the saw-tooth1 when the blow is given by the hammer.

These spring guide-lips a a' enable the operator to place the swage and give the blow with the hammer, and have the ciiect of such blow uniformly produced upon each tooth that is upset, and the same swage, by means of these spring lips or guides, can be used upon saw-teeth having different or varying n angles at their points,vwhich is not the ease with a swage without such springs lips; as, for instance, the swage shown iniig. 3 can only be used ou teeth having a limited width, as the jaws c c are iniiexible, and cannot expand to receive the points of teeth wider than the opening between the jaws c c, as can be done in the improved swage as seen in tig. l, where it shows the guide-lips sprung apart toV receive a tooth wider than the projecting points of the lips a' a are apart, when not forced asunder by the tooth.

The swaging-dies b b are adjustable, and can be varied with relation to the opening or jaws of the swage, which will allow of every variety of teethv having different angles at their points, to be operated upon by the same swage.

This swage is easy of construction, only requiring a short piece of spring steel ot the\proper width to be placed in the lateral hole, and surrounding the upsetting dies, and projecting, far enough to forni the lips or guides, over the common swage with upsetting dies, and is as strong as the ordinary swage, is sure to always produce the result desired, which is toexn pand the tooth in width at its extreme point, while the tooth is made alittle thicker a short distance from the point, by reason that the angle of the faces of the upsetting-dies is more obtuse than the point of the tooth before it is upset; hence the tooth is spread in width, and then the extra thickness of the tooth afterward reduced to its original angle and shape.

Having thus described by invention,

What I claim,and desire to secure by Letters Patent, is

l. The spring lip-guides a a, when attached to and forming a pai't of swage A, constructed and arranged to operate inthe manner as described.

2. The saw-swage herein described, composed of I the body A, spring a having elastic' lips a a', andadjustable upset-dies b l), constructed to operate in the manner and for the purpose set forth.

' WILLIAM OLEMSON. Witnesses:

ELISHA P. WHEELER, EDWARD MADDEN; 

